I'm getting ready to put together a 204 AR-15 and would like suggestions on scope choices. Two that I have in my finalist category are the Bushnell Elite 4200 6-24 x 40 AO Mil-Dot, and the Nikon BM 6-18 x 40 w/ BDC. I'd like opinions on these choices for my new AR. The gun will be used for informal paper punching on occasion, but mostly as a prarie dog setup (most shots between 30 and 500 yards). I have a SS 16x setup on my Armalite AR-30 in 300 Win Mag, and really like it, but I want adjustable power for up close shots on the 204. I've never looked through one of the Nikon's, but did get to look through an Elite 4200 3-9, and WOW......what great glass!! BTW other opinions and or suggestions would also be greatly appreciated !!